package com.zjw.gateway.config;

import java.util.ArrayList;
import java.util.List;
import lombok.AllArgsConstructor;
import org.springframework.beans.factory.annotation.Autowired;
import springfox.documentation.swagger.web.SwaggerResource;
import springfox.documentation.swagger.web.SwaggerResourcesProvider;

import org.springframework.cloud.gateway.config.GatewayProperties;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.support.NameUtils;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;

@Component
@Primary
@AllArgsConstructor
public class SwaggerProvider implements SwaggerResourcesProvider {
  private static final String API_URI = "/v2/api-docs";
  @Autowired
  private RouteLocator routeLocator;
  @Autowired
  private GatewayProperties gatewayProperties;


  @Override
  public List<SwaggerResource> get() {
    List<SwaggerResource> resources = new ArrayList<>();
    List<String> routes = new ArrayList<>();
    routeLocator.getRoutes().subscribe(route -> routes.add(route.getId()));
    gatewayProperties.getRoutes().stream().filter(routeDefinition -> routes.contains(routeDefinition.getId()))
        .forEach(routeDefinition -> routeDefinition.getPredicates().stream()
            .filter(predicateDefinition -> ("Path").equalsIgnoreCase(predicateDefinition.getName()))
            .forEach(predicateDefinition -> resources.add(swaggerResource(routeDefinition.getId(),
                predicateDefinition.getArgs().get(NameUtils.GENERATED_NAME_PREFIX + "0")
                    .replace("/**", API_URI)))));
    return resources;
  }

  private SwaggerResource swaggerResource(String name, String location) {
    SwaggerResource swaggerResource = new SwaggerResource();
    swaggerResource.setName(name);
    swaggerResource.setLocation(location);
    swaggerResource.setSwaggerVersion("2.0");
    return swaggerResource;
  }
}
